What is the meaning of Well-formedness?

5-letter words containing

• 5-letter words containing c

• 5-letter words containing b

• 5-letter words containing l

• 5-letter words containing e

• 5-letter words containing i

5-letter words starting with

• 5-letter words starting with i

• 5-letter words starting with g

• 5-letter words starting with e

• 5-letter words starting with e

• 5-letter words starting with t

5-letter words in the middle

• 5-letter words in the middle d

• 5-letter words in the middle e

• 5-letter words in the middle I

• 5-letter words in the middle l

• 5-letter words in the middle a

5-letter words ending with

• 5-letter words ending with e

• 5-letter words ending with n

• 5-letter words ending with d

• 5-letter words ending with c

• 5-letter words ending with r

5-letter words excluding

• 5-letter words excluding e

• 5-letter words excluding i

• 5-letter words excluding e

• 5-letter words excluding n

• 5-letter words excluding g