As an adjective stretchy

is capable of stretching, elastic.

As an adverb stretchily is

in a stretchy way.

Elastically is a synonym of stretchily.

As adverbs the difference between elastically and stretchily

is that elastically is in an elastic manner while stretchily is in a stretchy way.

As a noun equipment

is the act of equipping, or the state of being equipped, as for a voyage or expedition.

As an adjective electrophonic is

relating to electronic equipment to produce sound (this adjectival sense is not comparable).

As adjectives the difference between sound and electrophonic

is that sound is healthy while electrophonic is relating to electronic equipment to produce sound (this adjectival sense is not comparable.

As an adverb sound

is soundly.

As an interjection sound

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

As a noun sound

is a sensation perceived by the ear caused by the vibration of air or some other medium.

As a verb sound

is to produce a sound.

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.

Siggie is an alternative form of siggy.

As nouns the difference between siggie and siggy

is that siggie is while siggy is (internet|informal) a sig (signature used in posted messages).

Phlogistics is a related term of phlogistic.

As an adjective phlogistic is

pertaining to phlogiston.

As an adjective phlogistic

is pertaining to phlogiston.

As an adverb phlogistically is

in a phlogistic way.

As an adjective unnotable

is not notable.

As an adverb unnotably is

in an unnotable way.

As adjectives the difference between notable and unnotable

is that notable is (obsolete) useful; profitable or notable can be worthy of notice; remarkable; memorable; noted or distinguished while unnotable is not notable.

As a noun notable

is a person or thing of distinction.

Insignificant is a synonym of unnotable.

As adjectives the difference between insignificant and unnotable

is that insignificant is not significant; not important, consequential, or having a noticeable effect while unnotable is not notable.