Miscellaneous topics that do not fit into specific categories.
Yep - you can buy individual apps, although buying individual apps separately costs the same as buying a full bundle.
Go to https://www.microsoft.com/en-us/microsoft-365/p/word/cfq7ttc0hlkm?activetab=pivot:overviewtab (Word) and https://www.microsoft.com/en-us/microsoft-365/p/excel/cfq7ttc0hr4r?activetab=pivot:overviewtab (Excel).
As an alternative, you can get Office Home & Student 2021 which includes Word, Excel and PowerPoint. See https://www.microsoft.com/en-us/microsoft-365/p/office-home-student-2021/cfq7ttc0h8n8?activetab=pivot:overviewtab.
All of these are perpetual licenses, that is, they are not subscriptions and they are for one user to install on one PC or Mac.
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hth
Marcin