dildo vs sex toy

dildo and sex toy both are nouns.

Word	Noun	Adjective	Verb	Adverb
dildo	Yes	No	No	No
sex toy	Yes	No	No	No

As nouns, sex toy is a hypernym of dildo; that is, sex toy is a word with a broader meaning than dildo:

dildo: a vibrating device that substitutes for an erect penis to provide vaginal stimulation
sex toy: A sex toy is an object or device that is primarily used to facilitate human sexual pleasure, such as a dildo or vibrator.

Other hypernyms of dildo include vibrator, adult toy.

dildo (noun)	sex toy (noun)
a vibrating device that substitutes for an erect penis to provide vaginal stimulation	A sex toy is an object or device that is primarily used to facilitate human sexual pleasure, such as a dildo or vibrator.