nouns
a metallic tapping sound
"he counted the ticks of the clock"
any of two families of small parasitic arachnids with barbed proboscis; feed on blood of warm-blooded animals
is a member of
mites and ticks
is a type of (narrower)
mite or tick
a mark indicating that something has been noted or completed etc.
"as he called the role he put a check mark by each student's name"
a light mattress
is a type of (narrower)
a large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed