The large, whitish line in the middle of each "blade" is indicative of
Cryptocoryne parva, as Mudminnow mentioned. However, it's entirely possible that it IS micro sword. I've never kept it, but I've had C. parva
One thing that would help immensely is knowing its growth rate. Crypts, but especially parva, grow slow and can take years to have bushy growth like yours. Micro sword, however, is a very fast grower that I've heard. Swords also create 'runners'; small stem-like structures that grow additional plants. Crypts grow from rhizomes (these can kind of look like runners sometimes, except runners are very long, thin, and bright green. Rhizomes are bright white or tan-ish.)