What is the meaning of Proper_class?

5-letter words containing

• 5-letter words containing n

• 5-letter words containing o

• 5-letter words containing k

• 5-letter words containing d

• 5-letter words containing e

5-letter words starting with

• 5-letter words starting with o

• 5-letter words starting with t

• 5-letter words starting with m

• 5-letter words starting with t

• 5-letter words starting with l

5-letter words in the middle

• 5-letter words in the middle i

• 5-letter words in the middle r

• 5-letter words in the middle i

• 5-letter words in the middle b

• 5-letter words in the middle i

5-letter words ending with

• 5-letter words ending with o

• 5-letter words ending with s

• 5-letter words ending with r

• 5-letter words ending with a

• 5-letter words ending with n

5-letter words excluding

• 5-letter words excluding c

• 5-letter words excluding d

• 5-letter words excluding s

• 5-letter words excluding y

• 5-letter words excluding e