lien vs tax lien

lien and tax lien both are nouns.

Word	Noun	Adjective	Verb	Adverb
lien	Yes	No	No	No
tax lien	Yes	No	No	No

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

lien: the right to take another's property if an obligation is not discharged
tax lien: lien of which a tax collector may avail himself in default of taxes (analogous to a judgment lien)

lien (noun)	tax lien (noun)
the right to take another's property if an obligation is not discharged	lien of which a tax collector may avail himself in default of taxes (analogous to a judgment lien)
a large dark-red oval organ on the left side of the body between the stomach and the diaphragm; produces cells involved in immune responses