speed freak vs addict

speed freak and addict both are nouns.

Word	Noun	Adjective	Verb	Adverb
speed freak	Yes	No	No	No
addict	Yes	No	Yes	No

As nouns, addict is a hypernym of speed freak; that is, addict is a word with a broader meaning than speed freak:

speed freak: addict who habitually uses stimulant drugs (especially amphetamines)
addict: someone who is physiologically dependent on a substance or activity

speed freak (noun)	addict (noun)
addict who habitually uses stimulant drugs (especially amphetamines)	someone who is physiologically dependent on a substance or activity
	someone who is so ardently devoted to something that it resembles an addiction

speed freak (verb)	addict (verb)
	to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)