label vs severalize

label is a noun but severalize is not a noun.

Word	Noun	Adjective	Verb	Adverb
label	Yes	No	Yes	No
severalize	No	No	Yes	No

As verbs, severalize is a hypernym of label; that is, severalize is a word with a broader meaning than label:

label: distinguish (an element or atom) by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions
severalize: mark as different

Other hypernyms of label include differentiate, distinguish, secern, secernate, separate, severalise, tell, tell apart.

As verbs, severalize is a hypernym of label; that is, severalize is a word with a broader meaning than label:

label: distinguish (as a compound or molecule) by introducing a labeled atom
severalize: mark as different

Other hypernyms of label include differentiate, distinguish, secern, secernate, separate, severalise, tell, tell apart.

label (noun)	severalize (noun)
an identifying or descriptive marker that is attached to an object
a brief description given for purposes of identification
trade name of a company that produces musical recordings
a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction

label (verb)	severalize (verb)
distinguish (an element or atom) by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions	mark as different
distinguish (as a compound or molecule) by introducing a labeled atom	distinguish or separate
assign a label to; designate with a label
pronounce judgment on
attach a tag or label to