blockage vs implosion

blockage and implosion both are nouns.

Word	Noun	Adjective	Verb	Adverb
blockage	Yes	No	No	No
implosion	Yes	No	No	No

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

blockage (noun)	implosion (noun)
the act of blocking	the initial occluded phase of a stop consonant
an obstruction in a pipe or tube	a sudden inward collapse
the physical condition of blocking or filling a passage with an obstruction