What is the meaning of Backward_compatibility?

5-letter words containing

• 5-letter words containing u

• 5-letter words containing k

• 5-letter words containing b

• 5-letter words containing r

• 5-letter words containing e

5-letter words starting with

• 5-letter words starting with w

• 5-letter words starting with w

• 5-letter words starting with e

• 5-letter words starting with j

• 5-letter words starting with a

5-letter words in the middle

• 5-letter words in the middle e

• 5-letter words in the middle e

• 5-letter words in the middle l

• 5-letter words in the middle p

• 5-letter words in the middle e

5-letter words ending with

• 5-letter words ending with o

• 5-letter words ending with o

• 5-letter words ending with d

• 5-letter words ending with i

• 5-letter words ending with u

5-letter words excluding

• 5-letter words excluding a

• 5-letter words excluding u

• 5-letter words excluding g

• 5-letter words excluding f

• 5-letter words excluding k