The word proposal is a noun. It is something that is proposed for consideration.
The word "propose" can function as both a verb and a noun. As a verb, it is an action word indicating the act of suggesting or putting forward an idea. As a noun, it refers to a formal suggestion or plan presented for consideration.
The word successful is an adjective. It means to have accomplished whatever was previously proposed.
Quarantine Speech
Thomas Paine
In proposed, "pro-" is a prefix meaning "before" or "in favor of." It is used to indicate that something is being put forward or suggested for consideration.
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
'Soundly' is an adverb. It means 'completely' e.g. They soundly rejected all of the proposed changes. It can mean 'deeply'. e.g. He slept very soundly yesterday night.
Sashay is a verb. It means to walk in an exaggerated, showy manner, often with hip swaying.