plus

Plus is a synonym of helpful.

As a noun plus

is plus.

As an adjective helpful is

furnishing help; giving aid; useful.

In informal terms the difference between plus and extra

is that plus is to add; to subject to addition while extra is to an extraordinary degree.

As a conjunction plus

is sum of the previous one and the following one.

As a verb plus

is to add; to subject to addition.

As an adverb extra is

to an extraordinary degree.

As adjectives the difference between plus and beneficial

is that plus is being positive rather than negative or zero while beneficial is helpful or good to something or someone.

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.

As adjectives the difference between sound and plus

is that sound is healthy while plus is being positive rather than negative or zero.

As nouns the difference between sound and plus

is that sound is a sensation perceived by the ear caused by the vibration of air or some other medium while plus is a positive quantity.

As verbs the difference between sound and plus

is that sound is to produce a sound while plus is to add; to subject to addition.

As an adverb sound

is soundly.

As an interjection sound

is yes; used to show agreement or understanding, generally without much enthusiasm.

As a proper noun Sound

is the strait that separates Zealand (an island of Denmark) from Scania (part of Sweden); also sometimes called by the Danish name, Øresund.

As a conjunction plus is

sum of the previous one and the following one.

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As a conjunction plus

is sum of the previous one and the following one.

As a noun plus

is a positive quantity.

As an adjective plus

is being positive rather than negative or zero.

As a verb plus

is to add; to subject to addition.