Dedication is a noun.
Abraham Lincoln's speech was meant to dedicate Gettysburg
"Vowed" is the past tense of the verb "vow." It is a verb that means to solemnly promise to do something or to dedicate oneself to something.
Gettysburg address
The Gettysburg Address.
The speech that President Lincoln gave to dedicate the Union cemetery at Gettysburg, PA in 1863.
The Gettysburg Address to dedicate the cemetery in Gettysburg.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.