therefore vs thus

therefore is not a noun while thus is a noun.

Word	Noun	Adjective	Verb	Adverb
therefore	No	No	No	Yes
thus	Yes	No	No	Yes

As adverbs, therefore and thus are synonyms defined as:

therefore and thus: (used to introduce a logical conclusion) from that fact or reason or as a result

Other synonyms of therefore include hence, so, thence.

therefore (noun)	thus (noun)
	an aromatic gum resin obtained from various Arabian or East African trees; formerly valued for worship and for embalming and fumigation

therefore (adverb)	thus (adverb)
(used to introduce a logical conclusion) from that fact or reason or as a result	(used to introduce a logical conclusion) from that fact or reason or as a result
as a consequence	in the way indicated