unctuous

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective unctuous is

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

As adjectives the difference between unctuous and unguinous

is that unctuous is (of a liquid or fatty substance) oily or greasy while unguinous is consisting of, or resembling, fat or oil; unctuous; oleaginous.

As an adjective unctuous

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

As a noun pecksniffery is

unctuous, hypocritical or sanctimonious behaviour.

As an adjective unctuous

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

As a noun oleaginousness is

the state or condition of being oleaginous; oiliness, unctuousness.