What is the meaning of «_»?

5-letter words containing

• 5-letter words containing r

• 5-letter words containing c

• 5-letter words containing g

• 5-letter words containing f

• 5-letter words containing a

5-letter words starting with

• 5-letter words starting with r

• 5-letter words starting with e

• 5-letter words starting with e

• 5-letter words starting with e

• 5-letter words starting with g

5-letter words in the middle

• 5-letter words in the middle s

• 5-letter words in the middle n

• 5-letter words in the middle a

• 5-letter words in the middle p

• 5-letter words in the middle o

5-letter words ending with

• 5-letter words ending with e

• 5-letter words ending with a

• 5-letter words ending with l

• 5-letter words ending with e

• 5-letter words ending with l

5-letter words excluding

• 5-letter words excluding r

• 5-letter words excluding u

• 5-letter words excluding b

• 5-letter words excluding m

• 5-letter words excluding u