fixed vs unchangeable

fixed and unchangeable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fixed	No	Yes	No	No
unchangeable	No	Yes	No	No

fixed (adjective)	unchangeable (adjective)
securely placed or fastened or set	not changeable or subject to change
(of a number) having a fixed and unchanging value
fixed and unmoving
incapable of being changed or moved or undone; e.g. "frozen prices"