flood submerge inundate 的区别

inundate
v.淹没
To cover with water, especially floodwaters.
淹没：用水淹盖，特指洪水泛滥
To overwhelm as if with a flood; swamp:
压倒：似洪水般压倒；浸没：
The theater was inundated with requests for tickets.
剧场为索票的声势所压倒

submerge [简明英汉词典]
v.浸没, 淹没, 掩没
vi.潜水
To place under water.See Synonyms at dip
置于水下参见 dip
To cover with water; inundate.
浸没，淹没
To hide from view; obscure.
湮没，湮灭，使沉浸
v.intr.（不及物动词）
To go under or as if under water.
（好像）潜入水中

flood
n.洪水, 水灾, (因雨)涨潮, [诗]水
vt.淹没, 使泛滥, 注满, 充满
vi.被水淹, 溢出, 涌进, 喷出, 涌出