What is the meaning of Equivalence_relation?

5-letter words containing

• 5-letter words containing i

• 5-letter words containing s

• 5-letter words containing o

• 5-letter words containing c

• 5-letter words containing g

5-letter words starting with

• 5-letter words starting with g

• 5-letter words starting with g

• 5-letter words starting with e

• 5-letter words starting with a

• 5-letter words starting with t

5-letter words in the middle

• 5-letter words in the middle e

• 5-letter words in the middle d

• 5-letter words in the middle s

• 5-letter words in the middle u

• 5-letter words in the middle e

5-letter words ending with

• 5-letter words ending with l

• 5-letter words ending with w

• 5-letter words ending with k

• 5-letter words ending with f

• 5-letter words ending with s

5-letter words excluding

• 5-letter words excluding k

• 5-letter words excluding i

• 5-letter words excluding a

• 5-letter words excluding e

• 5-letter words excluding i