What is the meaning of Field_restrictions?

5-letter words containing

• 5-letter words containing r

• 5-letter words containing b

• 5-letter words containing l

• 5-letter words containing p

• 5-letter words containing e

5-letter words starting with

• 5-letter words starting with i

• 5-letter words starting with e

• 5-letter words starting with x

• 5-letter words starting with i

• 5-letter words starting with n

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 g

• 5-letter words in the middle e

• 5-letter words in the middle f

5-letter words ending with

• 5-letter words ending with l

• 5-letter words ending with e

• 5-letter words ending with c

• 5-letter words ending with r

• 5-letter words ending with i

5-letter words excluding

• 5-letter words excluding l

• 5-letter words excluding u

• 5-letter words excluding w

• 5-letter words excluding c

• 5-letter words excluding o