Interesting.
Here if you don't used at least 4 words than end in "o", 3 that end in "e", a couple that end in "a" and one or two that end in "i", there will be no precision.
So here regular Americano- means an espresso with just water, ie black
Regular is regular, black coffee brewed. Not sure how regular could mean cream and sugar added in quantities at the vagary of the barista.
In most places if you order a regular black coffee it come from a drip brewer that may have been sitting for a while. If you order a Americano or Long Black or specify a pour over coffee then it will be made right there on the spot.