teddy vs undergarment

teddy and undergarment both are nouns.

Word	Noun	Adjective	Verb	Adverb
teddy	Yes	No	No	No
undergarment	Yes	No	No	No

As nouns, undergarment is a hypernym of teddy; that is, undergarment is a word with a broader meaning than teddy:

Other hypernyms of teddy include unmentionable.

teddy (noun)	undergarment (noun)
a woman's sleeveless undergarment	a garment worn under other garments
plaything consisting of a child's toy bear (usually plush and stuffed with soft materials)