Excruciating is an adjective.
adjective
Proper is an adjective.
Truman is a name, so therefore as a part of speech it is a proper noun.
Proper noun
A proper noun.
Proper noun.
Proper noun
Proper adjective
Proper is an adjective, factor is a noun.
Proper name, noun
It's a proper noun
Ithaca is a proper noun.