Buzzard: a large hawk-like bird of prey (unless you are in the US where it is some sort of vulture). Not an uncommon word, but I’m a city mouse so I just gathered it is a bird, and that it is feared by the fauna in the inlaws’ garden.
Finial: an ornament at the top, end, or corner of a structure or object. I learnt that one of Stuart’s maternal grandfather’s many hobbies was to restore grandfather clocks (and their finials).
Skein: a coiled length of thread or yarn (or a complicated situation). Stuart’s aunt mentioned it and then had to show us what she meant.