Is rowboat a compound noun?
Yes, rowboat is a compound noun made up of the word 'row' and 'boat'.
The noun 'orchestra' is not a compound noun. A compound noun is a word made of two or more individual words that merge to form a noun with a meaning of its own. The noun 'orchestra' is sometimes used as a collective noun as 'an orchestra of musicians'. A collective noun is a function of a noun, not a form of a noun.