der, die, das triples

I'm trying to compile a list of  triples of nouns each with a  ''der'',
''die'' and ''das'' noun.
The nouns in the triple should have a logical connection.

Examples:  der Hahn,  die Henne, das Ei.
                 der Strom, die Birne,   as Licht

This helps learning the genders, as it is easier to learn three with a
connection than it is to learn one.

I appreciate any triples that you can send me.

If you mail them directly to me, please use the word "triples" in the
subject line.

Thank you.

P.S. Are there any other places besides News where it might be appropriate
to make this posting?

Hilbert Levitz
levitz@[EMAIL PROTECTED]