What is the meaning of Partial_ordering_relation?

5-letter words containing

• 5-letter words containing e

• 5-letter words containing p

• 5-letter words containing i

• 5-letter words containing l

• 5-letter words containing e

5-letter words starting with

• 5-letter words starting with o

• 5-letter words starting with g

• 5-letter words starting with e

• 5-letter words starting with a

• 5-letter words starting with l

5-letter words in the middle

• 5-letter words in the middle e

• 5-letter words in the middle m

• 5-letter words in the middle u

• 5-letter words in the middle e

• 5-letter words in the middle o

5-letter words ending with

• 5-letter words ending with r

• 5-letter words ending with i

• 5-letter words ending with w

• 5-letter words ending with l

• 5-letter words ending with o

5-letter words excluding

• 5-letter words excluding i

• 5-letter words excluding o

• 5-letter words excluding s

• 5-letter words excluding k

• 5-letter words excluding e