What is the meaning of Distinguished_open_sets?

5-letter words containing

• 5-letter words containing c

• 5-letter words containing u

• 5-letter words containing t

• 5-letter words containing e

• 5-letter words containing s

5-letter words starting with

• 5-letter words starting with s

• 5-letter words starting with o

• 5-letter words starting with u

• 5-letter words starting with h

• 5-letter words starting with o

5-letter words in the middle

• 5-letter words in the middle v

• 5-letter words in the middle u

• 5-letter words in the middle n

• 5-letter words in the middle l

• 5-letter words in the middle d

5-letter words ending with

• 5-letter words ending with e

• 5-letter words ending with t

• 5-letter words ending with r

• 5-letter words ending with e

• 5-letter words ending with d

5-letter words excluding

• 5-letter words excluding r

• 5-letter words excluding r

• 5-letter words excluding a

• 5-letter words excluding i

• 5-letter words excluding s