Why are people framed as "Euroskeptic" or "Islamophobic", but not "Europhobic" or "Islamoskeptic"?

-"Antisemitism claims at the Royal Court theatre" 2022. Letters. The Guardian. (https://www.theguardian.com/stage/2022/sep/22/antisemitism-claims-at-the-royal-court-theatre)
-Bayoumi, Moustafa. 2022. The alleged Buffalo shooter was also inspired by Islamophobia. That’s telling. The Guardian (https://www.theguardian.com/commentisfree/2022/may/22/buffalo-shooter-islamophobia-replacement-theory)
-Google search: Euroskeptic, Europhobic, Europhobe