What is the meaning of Equivalence_relation?

5-letter words containing

• 5-letter words containing a

• 5-letter words containing c

• 5-letter words containing c

• 5-letter words containing w

• 5-letter words containing e

5-letter words starting with

• 5-letter words starting with m

• 5-letter words starting with n

• 5-letter words starting with l

• 5-letter words starting with t

• 5-letter words starting with o

5-letter words in the middle

• 5-letter words in the middle o

• 5-letter words in the middle e

• 5-letter words in the middle g

• 5-letter words in the middle r

• 5-letter words in the middle e

5-letter words ending with

• 5-letter words ending with c

• 5-letter words ending with i

• 5-letter words ending with e

• 5-letter words ending with n

• 5-letter words ending with v

5-letter words excluding

• 5-letter words excluding t

• 5-letter words excluding e

• 5-letter words excluding n

• 5-letter words excluding o

• 5-letter words excluding p