visual sensation vs sensation

visual sensation and sensation both are nouns.

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

As nouns, sensation is a hypernym of visual sensation; that is, sensation is a word with a broader meaning than visual sensation:

Other hypernyms of visual sensation include aesthesis, esthesis, sense datum, sense experience, sense impression.

visual sensation (noun)	sensation (noun)
the perceptual experience of seeing	an unelaborated elementary awareness of stimulation
	the faculty through which the external world is apprehended
	a general feeling of excitement and heightened interest
	someone who is dazzlingly skilled in any field
	a state of widespread public excitement and interest