internal-combustion engine vs outboard

outboard vs internal-combustion engine

internal-combustion engine and outboard both are nouns.

internal-combustion engine is not an adjective while outboard is an adjective.

Word	Noun	Adjective	Verb	Adverb
internal-combustion engine	Yes	No	No	No
outboard	Yes	Yes	No	No

As nouns, outboard is a hyponym of internal-combustion engine; that is, outboard is a word with a more specific, narrower meaning than internal-combustion engine:

internal-combustion engine: a heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine
outboard: internal-combustion engine that mounts at stern of small boat

Other hyponyms of internal-combustion engine include diesel, diesel engine, diesel motor, four-stroke engine, four-stroke internal-combustion engine, gas engine, gasoline engine, petrol engine, outboard motor, radial engine, rotary engine, reciprocating engine, rotary engine, valve-in-head engine.

internal-combustion engine (noun)	outboard (noun)
a heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine	internal-combustion engine that mounts at stern of small boat
	a motorboat with an outboard motor

internal-combustion engine (adjective)	outboard (adjective)
	located away from the midline of a vessel or aircraft

Difference between internal-combustion engine and outboard

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