NicholasW: There are no other normal words in English containing -eng-

Tsuwm: I challenge that with a vengeance; what about penguin?

Tsuwm, I think Nicholas was talking about words coming to us from Old English (aka Anglo-Saxon), while your examples are later imports.

1. NickW quoted penguin as a 'modern' import

2. How long have length and strength (lingth and stringth?!)been around in English?