ink

nouns

a liquid used for printing or writing or drawing
ink
is derived from
inky
is a type of (narrower)
a substance that is liquid at room temperature and pressure
liquid
dark protective fluid ejected into the water by cuttlefish and other cephalopods
ink
is a type of (narrower)
the liquid parts of the body
bodily fluid, body fluid, humor, humour, liquid body substance

verbs

append one's signature to
"They inked the contract"
ink
is a type of (narrower)
be engaged by a written agreement
"He signed to play the casino on Dec. 18"; "The soprano signed to sing the new opera"
sign
mark, coat, cover, or stain with ink
"he inked his finger"
ink
is a type of (narrower)
make or leave a mark on
"the scouts marked the trail"; "ash marked the believers' foreheads"
mark
fill with ink
"ink a pen"
ink
is a type of (narrower)
make full, also in a metaphorical sense
"fill a container"; "fill the child with pride"
fill, fill up, make full