Here is a list of nouns that start with COA.
coach, coaching, coachman, coachmen, coachwork
coahr, coahse, coal, coalescence, coalition
coast, coastline, coat, coating
Hope you enjoy this page of nouns that start with coa and the rest of this noun list a-z site as well.
Help make this a better resource by adding more nouns in the comments section. Thanks.