What is the meaning of Categorical_variable?

5-letter words containing

• 5-letter words containing u

• 5-letter words containing r

• 5-letter words containing l

• 5-letter words containing f

• 5-letter words containing s

5-letter words starting with

• 5-letter words starting with t

• 5-letter words starting with d

• 5-letter words starting with a

• 5-letter words starting with j

• 5-letter words starting with o

5-letter words in the middle

• 5-letter words in the middle e

• 5-letter words in the middle l

• 5-letter words in the middle n

• 5-letter words in the middle a

• 5-letter words in the middle o

5-letter words ending with

• 5-letter words ending with e

• 5-letter words ending with s

• 5-letter words ending with f

• 5-letter words ending with i

• 5-letter words ending with e

5-letter words excluding

• 5-letter words excluding r

• 5-letter words excluding e

• 5-letter words excluding e

• 5-letter words excluding r

• 5-letter words excluding a