synthesis vs syllogism

synthesis and syllogism both are nouns.

Word	Noun	Adjective	Verb	Adverb
synthesis	Yes	No	No	No
syllogism	Yes	No	No	No

As nouns, syllogism is a hyponym of synthesis; that is, syllogism is a word with a more specific, narrower meaning than synthesis:

synthesis: reasoning from the general to the particular (or from cause to effect)
syllogism: deductive reasoning in which a conclusion is derived from two premises

synthesis (noun)	syllogism (noun)
the combination of ideas into a complex whole	deductive reasoning in which a conclusion is derived from two premises
reasoning from the general to the particular (or from cause to effect)
the process of producing a chemical compound (usually by the union of simpler chemical compounds)