tea garden vs garden

tea garden and garden both are nouns.

Word	Noun	Adjective	Verb	Adverb
tea garden	Yes	No	No	No
garden	Yes	Yes	Yes	No

As nouns, garden is a hypernym of tea garden; that is, garden is a word with a broader meaning than tea garden:

tea garden (noun)	garden (noun)
a public garden where tea is served	a plot of ground where plants are cultivated
	a yard or lawn adjoining a house
	the flowers or vegetables or fruits or herbs that are cultivated in a garden

tea garden (adjective)	garden (adjective)
	the usual or familiar type

tea garden (verb)	garden (verb)
	work in the garden