In order to create the right sound, Italian nouns ending in –co, -go, -ca, -ga
will often insert an –h before the plural ending (-i or –e). E.g.,
il lago > i laghi = the lake > the lakes
la banca > le banche = the bank > the banks
Following is a chart of masculine words ending in –co and -go that do not insert an –h in the plural. E.g.,