Is Romanticism the same as Objectivism?

Objectivism is the name Ayn Rand gave to her system of philosophy.

Romanticism (according to Webster) is:

a literary, artistic, and philosophical movement originating in the 18th century, characterized chiefly by a reaction against neoclassicism and an emphasis on the imagination and emotions, and marked especially in English literature by sensibility and the use of autobiographical material, an exaltation of the primitive and the common man, an appreciation of external nature, an interest in the remote, a predilection for melancholy, and the use in poetry of older verse forms

So I would venture to say "No they can't be used interchangeably." As for their differences, I'll leave that as an "exercise left to the student". HINT: One is a systematic philosophy for living on earth. The other is a name given to an 18th century movement emphasizing imagination and emotions.