This is one of those things where a whole lot of redundant societal arguments and misunderstandings could be averted if we just used two different words for the two different concepts.
The real problem is however a philosophical one, how to drive down the point that there is no absolute truth,just absolute contradiction that disproves a (now disfunct) scientific theory . Unless you are making certain axiomatic assumptions or using the constructs of language for example 'all single men are bachelors', the best we can do is let our best theories make predictions and then conduct experiments to test those predictions.