Ball

мяч

mjač

(object, generally spherical, used for playing games)

шар

šar

(solid or hollow sphere)

я́йка

jájka

(testicle — see also testicle)

ядро́

jadró

(ballistics: a solid nonexplosive missile)

яе́чка

jajéčka

(testicle — see also testicle)

яйцо́

jajcó

(testicle — see also testicle)