-ard

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. One that habitually or excessively is in a specified condition or performs a specified action: drunkard.

Century Dictionary and Cyclopedia

1. n. A suffix in nouns of French origin or of a French type. In personal nouns it usually has a sinister implication, as in bastard, coward, dotard, dullard, drunkard, wizard, etc. In other nouns its force, originally intensive, is now scarcely felt, as in billiard, bombard, placard, standard, tankard, etc. In braggard (also braggart) and standard (tree) it has taken the place of -ar = -er; in cockade, originally cockard, and in costard, custard, originally as if costate, crustate, the suffixes -ard and -ate (-ade) have changed places.

Wiktionary

1. n. someone who is in a specified condition e.g. a drunkard

GNU Webster's 1913

1. The termination of many English words; It usually has the sense of one who has to a high or excessive degree the quality expressed by the root.