What is the meaning of Non-trivial?

5-letter words containing

• 5-letter words containing e

• 5-letter words containing l

• 5-letter words containing s

• 5-letter words containing f

• 5-letter words containing d

5-letter words starting with

• 5-letter words starting with e

• 5-letter words starting with l

• 5-letter words starting with a

• 5-letter words starting with i

• 5-letter words starting with d

5-letter words in the middle

• 5-letter words in the middle u

• 5-letter words in the middle l

• 5-letter words in the middle i

• 5-letter words in the middle a

• 5-letter words in the middle a

5-letter words ending with

• 5-letter words ending with d

• 5-letter words ending with l

• 5-letter words ending with c

• 5-letter words ending with e

• 5-letter words ending with m

5-letter words excluding

• 5-letter words excluding s

• 5-letter words excluding a

• 5-letter words excluding o

• 5-letter words excluding c

• 5-letter words excluding u