The difference between Geometric isomerism and Structural isomerism
When used as nouns, geometric isomerism means a form of isomerism in which, in one isomer two atoms or groups are on the same side of the plane of a double bond or ring, whereas in the other isomer they are on opposite sides, whereas structural isomerism means a form of isomerism in which the same atoms are arranged in different orders, either having the same or different functional groups.
check bellow for the other definitions of Geometric isomerism and Structural isomerism
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Geometric isomerism as a noun (chemistry, dated, [[deprecated]] by [[IUPAC]]):
A form of isomerism in which, in one isomer two atoms or groups are on the same side of the plane of a double bond or ring, whereas in the other isomer they are on opposite sides; these are cis- and trans- isomers, respectively.
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Structural isomerism as a noun (chemistry):
A form of isomerism in which the same atoms are arranged in different orders, either having the same or different functional groups.