What is the meaning of Interval_variable?

5-letter words containing

• 5-letter words containing a

• 5-letter words containing p

• 5-letter words containing w

• 5-letter words containing n

• 5-letter words containing o

5-letter words starting with

• 5-letter words starting with o

• 5-letter words starting with r

• 5-letter words starting with s

• 5-letter words starting with e

• 5-letter words starting with n

5-letter words in the middle

• 5-letter words in the middle o

• 5-letter words in the middle n

• 5-letter words in the middle l

• 5-letter words in the middle i

• 5-letter words in the middle l

5-letter words ending with

• 5-letter words ending with e

• 5-letter words ending with m

• 5-letter words ending with n

• 5-letter words ending with s

• 5-letter words ending with o

5-letter words excluding

• 5-letter words excluding b

• 5-letter words excluding i

• 5-letter words excluding a

• 5-letter words excluding c

• 5-letter words excluding c