Structural isomers are compounds that have the same formula, but different constituents. Dimethyl ether (CH3OCH3) and ethanol (CH3CH2OH), for example, are constitutional isomers with general formula C3H6O.
Generalic, Eni. "Structural isomer." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table