What is the meaning of Non-standard?

5-letter words containing

• 5-letter words containing c

• 5-letter words containing l

• 5-letter words containing e

• 5-letter words containing s

• 5-letter words containing n

5-letter words starting with

• 5-letter words starting with e

• 5-letter words starting with e

• 5-letter words starting with n

• 5-letter words starting with u

• 5-letter words starting with e

5-letter words in the middle

• 5-letter words in the middle u

• 5-letter words in the middle e

• 5-letter words in the middle t

• 5-letter words in the middle a

• 5-letter words in the middle i

5-letter words ending with

• 5-letter words ending with i

• 5-letter words ending with u

• 5-letter words ending with c

• 5-letter words ending with e

• 5-letter words ending with t

5-letter words excluding

• 5-letter words excluding i

• 5-letter words excluding a

• 5-letter words excluding n

• 5-letter words excluding t

• 5-letter words excluding b