Description:

The term 'paj' means stuff or substance and is a very general and widely-used word, often found in compounds essentially as a suffix where X-paj is 'stuff made of X'.

Noun:

As a noun, paj just means stuff or substance.

Modifier:

The modifier form 'pajys' is a popular way to say real or substantial, and someties has overtones of 'significant'.

Verb:

Paj is little used as a verb. When used, it is a pali verb simply meaning to 'be substantial ot real'.