theme song vs strain

theme song and strain both are nouns.

Word	Noun	Adjective	Verb	Adverb
theme song	Yes	No	No	No
strain	Yes	No	Yes	No

As nouns, strain is a hypernym of theme song; that is, strain is a word with a broader meaning than theme song:

theme song: a melody that recurs and comes to represent a musical play or movie
strain: a succession of notes forming a distinctive sequence

Other hypernyms of theme song include air, line, melodic line, melodic phrase, melody, tune.

As nouns, strain is a hypernym of theme song; that is, strain is a word with a broader meaning than theme song:

theme song: a melody used to identify a performer or a dance band or radio/tv program
strain: a succession of notes forming a distinctive sequence

Other hypernyms of theme song include air, line, melodic line, melodic phrase, melody, tune.

theme song (noun)	strain (noun)
a melody that recurs and comes to represent a musical play or movie	an effortful attempt to attain a goal
a melody used to identify a performer or a dance band or radio/tv program	the act of singing
	an intense or violent exertion
	the general meaning or substance of an utterance
	a succession of notes forming a distinctive sequence
	a special variety of domesticated animals within a species
	(biology) a group of organisms within a species that differ in trivial ways from similar groups
	(physics) deformation of a physical body under the action of applied forces
	injury to a muscle (often caused by overuse); results in swelling and pain
	(psychology) nervousness resulting from mental stress
	difficulty that causes worry or emotional tension

theme song (verb)	strain (verb)
	cause to be tense and uneasy or nervous or anxious
	alter the shape of (something) by stress
	to exert much effort or energy
	use to the utmost; exert vigorously or to full capacity
	remove by passing through a filter
	separate by passing through a sieve or other straining device to separate out coarser elements
	become stretched or tense or taut
	rub through a strainer or process in an electric blender
	test the limits of