tendency vs buoyancy

tendency and buoyancy both are nouns.

Word	Noun	Adjective	Verb	Adverb
tendency	Yes	No	No	No
buoyancy	Yes	No	No	No

As nouns, buoyancy is a hyponym of tendency; that is, buoyancy is a word with a more specific, narrower meaning than tendency:

tendency: a characteristic likelihood of or natural disposition toward a certain condition or character or effect
buoyancy: the tendency to float in water or other liquid

Other hyponyms of tendency include heterosis, hybrid vigor, electronegativity, negativity, stainability, desire.

tendency (noun)	buoyancy (noun)
a characteristic likelihood of or natural disposition toward a certain condition or character or effect	the property of something weightless and insubstantial
an attitude of mind especially one that favors one alternative over others	irrepressible liveliness and good spirit
an inclination to do something	the tendency to float in water or other liquid
a general direction in which something tends to move	cheerfulness that bubbles to the surface