This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of frank.

v. Third-person singular simple present indicative form of frank.

"It is urged that in the old days when postage was dear, and "franks" were difficult to procure, and when the poor did not correspond at all, writers were very careful to write well and to say the very best they could in the best possible way -- to make their letters, in a word, worthy of the expense incurred."

Frank   

Banks    Hanks    Manx    Yanks    bankes    banks    blanks    branks    cranks    danks