What is the meaning of Non-standard?

5-letter words containing

• 5-letter words containing t

• 5-letter words containing f

• 5-letter words containing n

• 5-letter words containing r

• 5-letter words containing h

5-letter words starting with

• 5-letter words starting with l

• 5-letter words starting with t

• 5-letter words starting with t

• 5-letter words starting with l

• 5-letter words starting with p

5-letter words in the middle

• 5-letter words in the middle t

• 5-letter words in the middle i

• 5-letter words in the middle u

• 5-letter words in the middle c

• 5-letter words in the middle s

5-letter words ending with

• 5-letter words ending with a

• 5-letter words ending with r

• 5-letter words ending with r

• 5-letter words ending with p

• 5-letter words ending with n

5-letter words excluding

• 5-letter words excluding n

• 5-letter words excluding o

• 5-letter words excluding t

• 5-letter words excluding u

• 5-letter words excluding a