Love is both an abstract noun and a/an:

A noun is a term that typically serves as the name for a particular object or group of objects, including live things, locations, events, traits, states of existence, and concepts. The abstract noun refers to qualities like kindness and love. In contrast, uncountable nouns are those that are incapable of counting. These nouns are not limited to just objects like dust or stars. Feelings like love cannot be counted as well. Thus, love is both an abstract and uncountable noun.