Realtor vs house agent

Realtor and house agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
Realtor	Yes	No	No	No
house agent	Yes	No	No	No

As nouns, house agent is a hypernym of Realtor; that is, house agent is a word with a broader meaning than Realtor:

Realtor: a real estate agent who is a member of the National Association of Realtors
house agent: a person who is authorized to act as an agent for the sale of land

Other hypernyms of Realtor include estate agent, land agent, real estate agent, real estate broker.

Realtor (noun)	house agent (noun)
a real estate agent who is a member of the National Association of Realtors	a person who is authorized to act as an agent for the sale of land