Thanatos vs death instinct

Thanatos and death instinct both are nouns.

Word	Noun	Adjective	Verb	Adverb
Thanatos	Yes	No	No	No
death instinct	Yes	No	No	No

As nouns, Thanatos and death instinct are synonyms defined as:

Thanatos and death instinct: (psychoanalysis) an unconscious urge to die

Other synonyms of Thanatos include death wish.

Thanatos (noun)	death instinct (noun)
(psychoanalysis) an unconscious urge to die	(psychoanalysis) an unconscious urge to die
(Greek mythology) the Greek personification of death; son of Nyx