plus

Improvement is a related term of plus.

As nouns the difference between improvement and plus

is that improvement is the act of improving]]; advancement or growth; [[promote|promotion in desirable qualities; progress toward what is better; melioration; as, the improvement of the mind, of land, roads, etc while plus is plus.

As adjectives the difference between plus and supplementary

is that plus is being positive rather than negative or zero while supplementary is additional; added to supply what is wanted.

As a conjunction plus

is sum of the previous one and the following one.

As a noun plus

is a positive quantity.

As a verb plus

is to add; to subject to addition.

Accumulation is a related term of plus.

As nouns the difference between accumulation and plus

is that accumulation is the act of amassing or gathering, as into a pile while plus is plus.

As nouns the difference between accretion and plus

is that accretion is the act of increasing by natural growth; especially the increase of organic bodies by the internal accession of parts; organic growth while plus is a positive quantity.

As a conjunction plus is

sum of the previous one and the following one.

As an adjective plus is

being positive rather than negative or zero.

As a verb plus is

to add; to subject to addition.