Frequency is a noun.
an inventor is a designer but a designer is not an inventor
inventor of fiberglass
The possessive form of the noun inventor is inventor's.Example: The inventor's patent was finally granted.
The word inventions is a noun. It is the plural form of invention.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
the part of speech sashay is a averb
Did is a verb, and not is an adverb. Didn't is not any part of speech. It's a contraction of did and not.
Adjective
The word speech is a noun.
No, but it's part of a noun which the noun is the part of speech.
Yes, conjunction is a part of speech.
What part of speech is thaw