I don't know anything about plants
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Not my area of expertise... but looking at the pictures, it looks like it has a distinctly square stem. This is a characteristic of the mint family Lamiaceae; the leaves look reasonable... but that's obviously an incomplete answer and not definitive.
Note that there are some iPhone & Android apps that help; look up 'LeafSnap' for example (I think that one's iPhone only and perhaps limited to trees)