balk vs straitjacket

balk and straitjacket both are nouns.

Word	Noun	Adjective	Verb	Adverb
balk	Yes	No	Yes	No
straitjacket	Yes	No	No	No

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

balk: something immaterial that interferes with or delays action or progress
straitjacket: anything immaterial that severely hinders or confines

Other hyponyms of balk include albatross, millstone, bind, diriment impediment, drag, obstacle, obstruction.

balk (noun)	straitjacket (noun)
an illegal pitching motion while runners are on base	a garment similar to a jacket that is used to bind the arms tightly against the body as a means of restraining a violent person
one of several parallel sloping beams that support a roof	anything immaterial that severely hinders or confines
something immaterial that interferes with or delays action or progress
the area on a billiard table behind the balkline

balk (verb)	straitjacket (verb)
refuse to comply