What is the meaning of Non-standard?

5-letter words containing

• 5-letter words containing a

• 5-letter words containing d

• 5-letter words containing r

• 5-letter words containing t

• 5-letter words containing u

5-letter words starting with

• 5-letter words starting with t

• 5-letter words starting with s

• 5-letter words starting with t

• 5-letter words starting with s

• 5-letter words starting with n

5-letter words in the middle

• 5-letter words in the middle s

• 5-letter words in the middle r

• 5-letter words in the middle n

• 5-letter words in the middle a

• 5-letter words in the middle e

5-letter words ending with

• 5-letter words ending with t

• 5-letter words ending with y

• 5-letter words ending with a

• 5-letter words ending with e

• 5-letter words ending with u

5-letter words excluding

• 5-letter words excluding i

• 5-letter words excluding e

• 5-letter words excluding m

• 5-letter words excluding i

• 5-letter words excluding l