Buy some butter.
In this context, 'like' is a verb.
A bread and butter speech is also known as an acceptance speech. This is something that is given when a person is elected to an office, or when a person has been given something.
In that sentence, was is being used as an auxiliary verb to help complete the passive verb phrase "was used".
"Peanut butter" is a compound noun, which consists of two nouns combined to create a single term that refers to a specific food product made from ground peanuts. In this phrase, "peanut" serves as an adjective to describe the type of butter, but together they function as a noun.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.