What is the meaning of Unit_of_language?

5-letter words containing

• 5-letter words containing s

• 5-letter words containing a

• 5-letter words containing x

• 5-letter words containing r

• 5-letter words containing e

5-letter words starting with

• 5-letter words starting with u

• 5-letter words starting with n

• 5-letter words starting with u

• 5-letter words starting with e

• 5-letter words starting with p

5-letter words in the middle

• 5-letter words in the middle b

• 5-letter words in the middle r

• 5-letter words in the middle l

• 5-letter words in the middle r

• 5-letter words in the middle k

5-letter words ending with

• 5-letter words ending with s

• 5-letter words ending with v

• 5-letter words ending with g

• 5-letter words ending with o

• 5-letter words ending with a

5-letter words excluding

• 5-letter words excluding p

• 5-letter words excluding d

• 5-letter words excluding n

• 5-letter words excluding n

• 5-letter words excluding l