3 letters:
bio
4 letters:
type
5 letters:
other,
solid,
based,
clean,
heavy,
grade,
cheap,
mixed,
dirty,
fluid,
oxide
6 letters:
fossil,
liquid,
sulfur,
octane,
leaded,
atomic,
exotic
7 letters:
nuclear,
gaseous,
various,
primary,
cleaner,
derived,
organic,
heavier,
cheaper,
quality,
refined,
ceramic,
burning,
lighter
8 letters:
residual,
volatile,
domestic,
suitable,
metallic,
unleaded
9 letters:
synthetic,
renewable,
alternate,
metabolic,
available,
expensive,
efficient
10 letters:
commercial,
automotive,
containing,
oxygenated,
irradiated,
substitute,
artificial
11 letters:
alternative,
traditional,
combustible,
competitive
12 letters:
conventional,
nonrenewable,
carbonaceous
Commonly used words are shown in bold. Rare words are dimmed. Click on a word above to view its definition.
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