sensation vs modality

sensation and modality both are nouns.

Word	Noun	Adjective	Verb	Adverb
sensation	Yes	No	No	No
modality	Yes	No	No	No

As nouns, modality is a hyponym of sensation; that is, modality is a word with a more specific, narrower meaning than sensation:

Other hyponyms of sensation include sense modality, sensory system, sensibility, sensitiveness, sensitivity.

sensation (noun)	modality (noun)
an unelaborated elementary awareness of stimulation	a method of therapy that involves physical or electrical therapeutic treatment
the faculty through which the external world is apprehended	a particular sense
a general feeling of excitement and heightened interest	a classification of propositions on the basis of whether they claim necessity or possibility or impossibility
someone who is dazzlingly skilled in any field	verb inflections that express how the action or state is conceived by the speaker
a state of widespread public excitement and interest