fuel 3586 - xulon {xoo'-lon}; from another form of the base of 3582; timber (as {fuel} or material); by implication a stick, club or tree or other wooden article or substance: -- staff, stocks, tree, wood.
fuel 5208 - hule {hoo-lay'}; perhaps akin to 3586; a forest, i.e. (by implication) {fuel}: -- matter.