intensity vs strength

intensity and strength both are nouns.

Word	Noun	Adjective	Verb	Adverb
intensity	Yes	No	No	No
strength	Yes	No	No	No

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

As nouns, intensity and strength are synonyms defined as:

intensity and strength: the amount of energy transmitted (as by acoustic or electromagnetic radiation)

Other synonyms of intensity include intensity level.

intensity (noun)	strength (noun)
high level or degree; the property of being intense	the property of being physically or mentally strong
chromatic purity: freedom from dilution with white and hence vivid in hue	an asset of special worth or utility
the magnitude of sound (usually in a specified direction)	permanence by virtue of the power to resist stress or force
the amount of energy transmitted (as by acoustic or electromagnetic radiation)	the amount of energy transmitted (as by acoustic or electromagnetic radiation)
	capability in terms of personnel and materiel that affect the capacity to fight a war
	physical energy or intensity
	capacity to produce strong physiological or chemical effects
	the power to induce the taking of a course of action or the embracing of a point of view by means of argument or entreaty
	the condition of financial success