There is class of adjectives that their meaning is "belong to" "pertain to" like grammaticus. (maybe that distinction is somewhat artificial, as one can say that magnus is "belongs to the magni")
Is there a perceptible different between using them and using the genitive case of the corresponding noun?
For example is there a different between:
Ab equinis pedibus procul recede (Trust not a horse's heels)
Ab equorum/equi pedibus procul recede.
Or between "furnus aeneus" and "furnus aeris", or between "ars grammaticae" and "ars grammatica"