Tom vs Negroid

Tom and Negroid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tom	Yes	No	No	No
Negroid	Yes	No	No	No

As nouns, Negroid is a hypernym of Tom; that is, Negroid is a word with a broader meaning than Tom:

Tom: (ethnic slur) offensive and derogatory name for a Black man who is abjectly servile and deferential to Whites
Negroid: a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today

Other hypernyms of Tom include African-American, Black, Negro, Black person, blackamoor.

Tom (noun)	Negroid (noun)
(ethnic slur) offensive and derogatory name for a Black man who is abjectly servile and deferential to Whites	a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today