[Wildgoose]

All the base structure and common words are Germanic/Scandinavian. Yes, "fancier" vocabulary and constructed words like television or telephone are Latin/Greek derived. You could restrict English to its Germanic roots and still make (stilted) conversation. You could not do the same using only its added French/Latin/Greek vocabulary.

[Retric]

Reducing things to exclusively Germanic/Scandinavian roots without any crossing to old French etc would massively restrict vocabulary so yes you could hold a conversation but you could also hold one without any of those words. Both could seem natural or really stilted depending on the subject and your approach to dialogue.

When you say fancy it’s not just allure or autocrat, but also words like age, air, alarm, aunt, chair, money, beef, dance, etc