junction vs synapse

junction and synapse both are nouns.

Word	Noun	Adjective	Verb	Adverb
junction	Yes	No	No	No
synapse	Yes	No	No	No

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

junction: the state of being joined together
synapse: the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle

Other hyponyms of junction include anastomosis, inosculation.

junction (noun)	synapse (noun)
an act of joining or adjoining things	the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle
the place where two or more things come together
something that joins or connects
the shape or manner in which things come together and a connection is made
the state of being joined together