The difference between Ignite and Set on fire
When used as verbs, ignite means to set fire to (something), to light (something), whereas set on fire means to cause to begin to burn.
check bellow for the other definitions of Ignite and Set on fire
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Ignite as a verb (transitive):
to set fire to (something), to light (something)
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Ignite as a verb (transitive):
to spark off (something), to trigger
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Ignite as a verb (intransitive):
to commence burning.
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Ignite as a verb (chemistry, transitive):
To subject to the action of intense heat; to heat strongly; often said of incombustible or infusible substances.
Examples:
"to ignite iron or platinum"
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Set on fire as a verb (transitive):
To cause to begin to burn.
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Set on fire as a verb (figuratively, transitive):
To arouse passionate feelings in.
Examples:
"You set my heart on fire."