What is the meaning of «_»?

5-letter words containing

• 5-letter words containing r

• 5-letter words containing n

• 5-letter words containing e

• 5-letter words containing u

• 5-letter words containing e

5-letter words starting with

• 5-letter words starting with e

• 5-letter words starting with a

• 5-letter words starting with a

• 5-letter words starting with e

• 5-letter words starting with e

5-letter words in the middle

• 5-letter words in the middle u

• 5-letter words in the middle y

• 5-letter words in the middle m

• 5-letter words in the middle l

• 5-letter words in the middle c

5-letter words ending with

• 5-letter words ending with s

• 5-letter words ending with r

• 5-letter words ending with l

• 5-letter words ending with s

• 5-letter words ending with i

5-letter words excluding

• 5-letter words excluding s

• 5-letter words excluding l

• 5-letter words excluding p

• 5-letter words excluding n

• 5-letter words excluding e