spoilsport

As a noun spoilsport

is someone who puts an end to other's fun, especially harmless fun.

As an adjective unctuous is

(of a liquid or fatty substance) oily or greasy.

As nouns the difference between spoilsport and travel

is that spoilsport is someone who puts an end to other's fun, especially harmless fun while travel is the act of traveling.

As a verb travel is

to be on a journey, often for pleasure or business and with luggage; to go from one place to another.

As nouns the difference between taxonomy and spoilsport

is that taxonomy is the science or the technique used to make a classification while spoilsport is someone who puts an end to other's fun, especially harmless fun.

Spoilsport is a synonym of miserabilist.

As nouns the difference between spoilsport and miserabilist

is that spoilsport is someone who puts an end to other's fun, especially harmless fun while miserabilist is one who is unhappy, or extols being miserable as a virtue; a philosopher of pessimism.