resistor

Resistor is simply resist plus the agent suffix -or, which marks 'the thing that does X.' That suffix traces back through English -or from Latin -tor/-ātor, itself from Proto-Italic *-tōr and ultimately Proto-Indo-European *-tōr.

The suffix -tor traveled from Latin into Old French as -eor, then into Middle English as -our, before settling into English as -or — the same ending later attached to resist to name the electrical component.

Because it shares the same agent suffix -or, resistor is structurally related to any English word ending in -or that names 'one who does' or 'that which does' something, all descending from that same Latin -tor lineage.