emulsifier vs surfactant

emulsifier and surfactant both are nouns.

Word	Noun	Adjective	Verb	Adverb
emulsifier	Yes	No	No	No
surfactant	Yes	No	No	No

As nouns, surfactant is a hypernym of emulsifier; that is, surfactant is a word with a broader meaning than emulsifier:

emulsifier: a surface-active agent that promotes the formation of an emulsion
surfactant: a chemical agent capable of reducing the surface tension of a liquid in which it is dissolved

Other hypernyms of emulsifier include surface-active agent, wetter, wetting agent.

emulsifier (noun)	surfactant (noun)
a surface-active agent that promotes the formation of an emulsion	a chemical agent capable of reducing the surface tension of a liquid in which it is dissolved