HooYah Deep Sea
starboard and larboard.
Both from Norse, stjaarbort for "steering board [side]" and Ljaarbort "Lading/loading board [side]."
The Germanic Anglo-saxon versions were similar, and survived the addition of Norman French into English.
Shouting "larboard" and "starboard" from a mast top in the wind being pretty complicated, and the Royal Navy having a habit of "collecting" sailors based on physical fitness rather than English as a first language, wound up wanting a different word for one or the other..
So the loading, larboard* side being the side presented to a dock or pier or jettty, near logical to call it the "port" side.
Despite modern claims to the contrary, it had nothing to do with the twon of Oporto in Portugal, or its most famous fortified spirit, Port wine. The adoption of Portuguese wine due to wars with France occurs mach later in history.
Quay-a stone structure connecting deeper water to the shore for loading ship comes from Middle inglish Kaye via middle French keye originally from Celtic/Gaulish caio.
Harbour is a mix of Frenc and Saxony and and Frisian, began as "encampment" with a sense of "encircling."
Pier is straight out of Latin pere.
Port, meaning a place for lading ships is ultimately from Latin Portus.
Words can be fascinating, and frustrating, to study.
__________________________
*Despite being phonetically similar Larboard and Larder do not share a root. Despite larder representing a storingplace or place of collection. Larder comes to us via Middle French larde, a pantry. Lard as in [pork] fat is from Latin lardum/laridum, which may be from Greek for fat.