the supersyllabogram SU in Linear A, a small cup with handles & the largest pithos size:

Minoan Pithos and small cup with a handle

The supersyllabogram SU in Linear A has two meanings, context dependent. The first is:

1. SU = supa3 (supai)/supa3ra (supaira) OM = a small cup with handles Cf. Linear B dipa mewiyo. The word depa/depu PGS de/paj de/pu (acc.?) = cup occurs in Linear A. Cf. Linear B dipa di/paj & Homeric de/pa

and the second is:

2. SU = supi/supu/supu2 OM = largest size pithos;

but not MOSE * NM1 supu/h sipu/h sipu/a i0pu/a = meal tub. MOSE * = decryption by Prof. Yuriy Mosenkis. This interpretation flies in the face of context on any Linear A tablet or fragment. It is all fine and well to conjecture a proto-Greek or Mycenaean-derived Greek word, but if you check your decipherment against extant tablets, then you may find it invalidated. This must always be done. Otherwise, you will end up with a meaning which is simply out of the question.