The difference between Fortitude and Set of one's jaw
When used as nouns, fortitude means mental or emotional strength that enables courage in the face of adversity, whereas set of one's jaw means the manner of one's lower facial expression, especially as suggesting firm resolve, or intensity of thought or feeling.
check bellow for the other definitions of Fortitude and Set of one's jaw
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Fortitude as a noun:
Mental or emotional strength that enables courage in the face of adversity.
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Fortitude as a noun (archaic):
Physical strength.
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Set of one's jaw as a noun (set phrase):
The manner of one's lower facial expression, especially as suggesting firm resolve, or intensity of thought or feeling.