Synonyms for Large-scale:

adj.

big (adjective)
good, considerable, large, extensive, healthy, sizable, great.
catholic (adjective)
worldwide.

n.

great, far-flung, scattered, worldwide, diffuse, countrywide, healthy, sizable, good, extensive, nationwide, all over the place, tidy, considerable, generalized, widespread, ubiquitous. coordinate, cartography, globe, grid, boundary, chart, contour, atlas, grid reference. large-scale (noun)
general, mass, large, big.

Other synonyms:

sizable. great, extensive. considerable. tidy, healthy. good. Other relevant words:
considerable, healthy, far-flung, good, widespread, sizable, diffuse, great, tidy, extensive.