Plaque

бля́ха

bljáxa

(flat, thin piece of clay, ivory, metal, etc., used for ornament)

бля́шка

bljáška

(flat, thin piece of clay, ivory, metal, etc., used for ornament)

зубно́й ка́мень

zubnój kámenʹ

(accumulation of biofilm, or bacteria, on teeth)

мемориа́льная доска́

memoriálʹnaja doská

(piece of flat metal with writing on it to remind people of a person or event)

табли́чка

tablíčka

(piece of flat metal with writing on it to remind people of a person or event)