What is the meaning of Non-trivial?

5-letter words containing

• 5-letter words containing h

• 5-letter words containing r

• 5-letter words containing v

• 5-letter words containing l

• 5-letter words containing r

5-letter words starting with

• 5-letter words starting with n

• 5-letter words starting with k

• 5-letter words starting with e

• 5-letter words starting with g

• 5-letter words starting with l

5-letter words in the middle

• 5-letter words in the middle l

• 5-letter words in the middle r

• 5-letter words in the middle t

• 5-letter words in the middle n

• 5-letter words in the middle d

5-letter words ending with

• 5-letter words ending with r

• 5-letter words ending with u

• 5-letter words ending with t

• 5-letter words ending with k

• 5-letter words ending with p

5-letter words excluding

• 5-letter words excluding l

• 5-letter words excluding e

• 5-letter words excluding i

• 5-letter words excluding t

• 5-letter words excluding e