What is the meaning of Prim_and_proper?

5-letter words containing

• 5-letter words containing r

• 5-letter words containing u

• 5-letter words containing a

• 5-letter words containing t

• 5-letter words containing h

5-letter words starting with

• 5-letter words starting with t

• 5-letter words starting with t

• 5-letter words starting with i

• 5-letter words starting with y

• 5-letter words starting with n

5-letter words in the middle

• 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 t

• 5-letter words in the middle t

5-letter words ending with

• 5-letter words ending with i

• 5-letter words ending with m

• 5-letter words ending with m

• 5-letter words ending with e

• 5-letter words ending with i

5-letter words excluding

• 5-letter words excluding i

• 5-letter words excluding y

• 5-letter words excluding t

• 5-letter words excluding a

• 5-letter words excluding s