sex toy vs dildo

sex toy and dildo both are nouns.

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

As nouns, dildo is a hyponym of sex toy; that is, dildo is a word with a more specific, narrower meaning than sex toy:

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.
dildo: a vibrating device that substitutes for an erect penis to provide vaginal stimulation

Other hyponyms of sex toy include cock ring, erection ring, tension ring.

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