a couple of

a coat of a coat of arms a cock of the loft a cock of the walk a coffee mill a cold cook a cold snap a cold span a cold spell a collection of a collection of china a colony of

trimethyl-uric acid trimethylacetaldoxime trimethylacetic acid trimethylacetonitrile trimethylamine trimethylamine hydrochloride trimethylamine oxidase trimethylamine oxide trimethylamino-acetic acid trimethylammoniopurinide