ПОЧКИ _|_ KIDNEYS / POCHKI [ˈpot͡ɕkʲɪ]     

Hint with an alternative definition: a paired organ in the body that filters the pour of blood (to check is it poison or pure liquid; a purification chief) produces urine (like a pee-chakra) / second definition: a burgeon or a sprout on a twig.

Hint with composition: поч (posh) + ки (kidney)

Hints with translation + consonant words (by sounds or letters): it is like a bud of a future posh flower

Russian pro-tip: в теле бочки для питья

Mental visualization: ПО (two kidneys) + ЧК (veins and arteries) + И (blood flow)