mechanic — a person who repairs and maintains machinery, motors, etc.: an automobile mechanic.
organic — noting or pertaining to a class of chemical compounds that formerly comprised only those existing in or derived from plants or animals, but that now includes all other compounds of carbon.
volcanic — of or relating to a volcano: a volcanic eruption.
Four-or-more syllable rhymes
east germanic — a branch of the Germanic languages no longer extant, comprising Gothic and probably others of which there are no written records. Abbreviation: EGmc.
inorganic — not having the structure or organization characteristic of living bodies.
ferdinand magellan — Ferdinand, c1480–1521, Portuguese navigator: discoverer of the Straits of Magellan 1520 and the Philippines 1521.
messianic — the promised and expected deliverer of the Jewish people.
north germanic — the subbranch of Germanic that includes the languages of Scandinavia and Iceland.
oceanic — of, living in, or produced by the ocean: oceanic currents.
transatlantic — crossing or reaching across the Atlantic: a transatlantic liner.
transoceanic — extending across or traversing the ocean: a transoceanic cable.
west germanic — a subbranch of Germanic that includes English, Frisian, Flemish, Dutch, Plattdeutsch, Yiddish, and German. Abbreviation: WGmc.