onomatopoeia for the sound of horse hooves, footsteps, or light machinery like a typewriter or machine gun

the sound of an object falling into water or hitting a surface

excellent or wonderful, typically used in a cute or playful manner (Internet slang)

(onom.) clunking sound

adorable or cute (Internet slang)

an organic heterocyclic compound with the molecular formula C4H4N2, specifically the 1,2-diazine isomer

(onom.) click