solid vs firm

solid and firm both are nouns.

solid and firm both are adjectives.

solid is not a verb while firm is a verb.

solid is not an adverb while firm is an adverb.

Word	Noun	Adjective	Verb	Adverb
solid	Yes	Yes	No	No
firm	Yes	Yes	Yes	Yes

As adjectives, solid and firm are synonyms defined as:

solid and firm: not soft or yielding to pressure

solid (noun)	firm (noun)
a three-dimensional object, structurally rigid, usually resistant to changes of shape or volume	the members of a business organization that owns or operates one or more establishments
the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape
matter that is solid at room temperature and pressure

solid (adjective)	firm (adjective)
of definite shape and volume; firm; neither liquid nor gaseous	unwavering in devotion to friend or vow or cause
entirely of one substance with no holes inside	securely fixed in place
having length, breadth and thickness	strong and sure
characterized by good substantial quality	not soft or yielding to pressure
not soft or yielding to pressure	possessing the tone and resiliency of healthy tissue
of one substance or character throughout	marked by firm determination or resolution; not shakable
impenetrable for the eye	securely established
meriting respect or esteem	not subject to revision or change
of a substantial character and not frivolous or superficial	(of especially a person's physical features) not shaking or trembling
financially dependable	not liable to fluctuate or especially to fall
of good quality and condition; solidly built
uninterrupted in space; having no gaps or breaks
acting together as a single undiversified whole
providing abundant nourishment
of the same color throughout

solid (verb)	firm (verb)
	become taut or tauter
	make taut or tauter

solid (adverb)	firm (adverb)
	with resolute determination

Difference between solid and firm

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