One occurence of H99 אגם
H98 אגם 'ăgam
From an unused root (meaning to collect as water); a marsh; hence a rush (as growing in swamps); hence a stockade of reeds
KJV Usage: pond, pool, standing [water].
H100 אגמון 'agmôn
From the same as H98; a marshy pool (others from a different root, a kettle); by implication a rush (as growing there); collectively a rope of rushes
KJV Usage: bulrush, caldron, hook, rush.