Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Old Armenian եօթն
Proto-Indo-European *septḿ̥ (inherited)
Old Armenian եաւթն (mention)

Ancient Greek ἑπτά (cognate)
Armenian յոթ (inherited)
Old Armenian եօթնեւտասն (compound)
Old Armenian եօթնուտասն (compound)
Old Armenian եօթնհարիւր (compound)
Old Armenian եօթներորդ (suffix)
Old Armenian եօթանեքին (suffix)
Old Armenian եօթանեքեան (suffix)
Old Armenian եօթնեկին (suffix)
Old Armenian եօթնեկի (suffix)
Old Armenian եօթներեակ (suffix)
Old Armenian եօթնիցս (suffix)