What is the meaning of -er?

A person or thing that does an action indicated by the root verb; used to form an agent noun.

A person or thing to which the root verb is done or can be done satisfactorily.

A person whose occupation is the root noun; a person characterized by the root.

A person or thing to which a certain number or measurement applies.

Used to form nouns shorter than more formal synonyms.

A person who is associated with, or supports a particular theory, doctrine, or political movement.

A thing that is related in some way to the root, such as by location or purpose.

Suffix denoting a resident or inhabitant of (the place denoted by the proper noun); used to form a demonym.

Suffix denoting residency in or around a place, district, area, or region.

Suffix used to form the plural of a small number of English nouns.

Person or thing connected with.

More; used to form the comparative.

More; used to form the comparative.

Frequently; used to form frequentative verbs.

Instance of (the verbal action); used to form nouns from verbs.

Used to form diminutives.

Used to form slang or colloquial equivalents of words.

A suffix creating adjectives from verbs, indicating aptitude, proneness, or tendency toward a specified action:

Junior, child, younger person.

-er

Used to form agent nouns from verbs; -er

person or thing that (does the action indicated by the root); used to form an agent noun.

forms nouns meaning the location or object where something is usually found

forms nouns meaning a plant which is cultivated to produce something

forms nouns meaning the purpose of something or an object used for that purpose

forms nouns and adjectives referring to an inhabitant of somewhere

forms nouns and adjectives referring to engaging in a profession

forms nouns and adjectives referring to being prone to some activity or characteristic

forms relational adjectives

their

them

-er. Forms the comparative of adjectives.

Forms infinitives of first-conjugation verbs

Forms nouns, often denoting professions

Used to form nouns referring to doer or who works on something.

order, position, value or similar indicated by the numeral

person or thing that does an action indicated by the root verb

person or thing that originates in the place indicated by the place name

suffix added to most of indefinite plural nouns, usually identical to Danish, but unlike Nynorsk and Swedish

Used to form indefinite plurals for most feminine nouns.

Used to form indefinite plurals for some masculine nouns.

Used to form present tense for one class of weak verbs.

Used to form present tense for strong verbs.

Alternative form of -or

Alternative form of -ier, verbal suffix

Alternative form of -ier, suffix indicating a profession

enclitic nominative of hī

denotes the nominative singular of adjectives, masculine a-stem, i-stem, u-stem, and an-stem, as well as feminine ijo-stem nouns

denotes the nominative and accusative plurals of r- and consonant stem nouns

Forms agent nouns from verbs, with the sense "someone or something that [verb]s".

Forms plural forms of many nouns.

Forms the present tense of many verbs.

Forms demonyms.

Forms informal action nouns from verbs.

Forms informal abbreviations of nouns, with elision.

Forms a piece of currency from numbers.

Forms a die throw result from numbers.

Forms agent nouns from verbs.

Forms nouns for a person associated with something.

Forms nouns denoting male inhabitants or residents of a place.

Formings adjectives denoting something originating from a place.

Forms the comparative form of adjectives.

Used to form the (strong) feminine singular genitive.

Used to form the (strong) feminine singular dative.

forms infinitives of first-conjugation verbs

forms nouns indicating the person who exercises a particular activity

Forms agent nouns etc. from verbs, suffixed to the verb stem.

Forms instance nouns from verbs.

Indicates something defined by a number; in the plural often all numbers with the same first digits

Used to form the plurals of some nouns.

Forms nouns indicating an inhabitant of a place, or a person originating from a place.

Forms invariable adjectives from place names, with a genitival meaning, indicating origin from or association with that place.

Forms the comparative form of adjectives.

Added to a shortened form of a noun, lengthening the first consonant following its first vowel, to derive a noun.

first-person singular present passive subjunctive of -ō

-er (suffix used to form agent nouns from verbs)

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-er, creates an agent noun

forms the infinitive of the second-conjugation verbs

Forms agent nouns from verbs; -er

Forms agent nouns from verbs; -er

the infinitive suffix for many verbs

One of two suffixes for indefinite plural for nouns of the third declension (common and neuter); the second one is -r

Suffix for present tense, active voice, indicative mood for one of the groups of Swedish verbs

Agent noun suffix, often for loan words ending with -ik.

Simple present and aorist tense marker

as soon as

Makes adjectives out of verbs

Makes nouns out of verbs

suffix for distributive numbers

A verb ending for infinitives.

verb suffix for the impersonal present subjunctive

verb suffix for the impersonal imperative

suffix forming nouns

Source: wiktionary.org