As nouns the difference between bel and tel
is that bel is water while tel is (automotive|aviation|organic chemistry) tetraethyllead (or tetraethyl lead, tetra-ethyl lead); a gasoline additive to boost octane rating.
bel
Noun
(
en noun)
A measure of relative power, defined as log10(P 1/P 2), where P1 and P2 are the measured and reference power respectively. See also decibel.
References
* Webster's Encyclopedic Unabridged Dictionary
English eponyms
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tel
English
Etymology 1
(en)
Noun
(
en noun)
telegraph
telegram
telephone
Etymology 2
From (etyl) .
Noun
(
en noun)
A hill or mound. (Used especially for land features in the Middle East and North Africa)