Catalyzes the hydrolysis of short-chain aliphatic amides to their corresponding organic acids with release of ammonia. Also exhibits in vitro acyl transferase activity, transferring the acyl moiety of short-chain amides to hydroxylamine to form hydroxamates. a monocarboxylic acid amide + H2O = a monocarboxylate + NH4(+) Belongs to the carbon-nitrogen hydrolase superfamily. Aliphatic amidase family.