tick vs check up on

tick is a noun but check up on is not a noun.

Word	Noun	Adjective	Verb	Adverb
tick	Yes	No	Yes	No
check up on	No	No	Yes	No

tick (noun)	check up on (noun)
any of two families of small parasitic arachnids with barbed proboscis; feed on blood of warm-blooded animals
a light mattress
a mark indicating that something has been noted or completed etc.
a metallic tapping sound

tick (verb)	check up on (verb)
put a check mark on or near or next to	examine so as to determine accuracy, quality, or condition
sew
make a clicking or ticking sound
make a sound like a clock or a timer