Mysql Trigger, validating data

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MySQL

trigger

i have to table one cantaine my key words and the other my data, i want to validate my data with table key_word by trigger in myqsl

table key_word
+-------+---------+
| word  |  field  |
+-------+---------+
|  w1   |  field3 |
|  w2   |  field1 |
|  w3   |  field1 |
|  w4   |  field2 |
|  w5   |  field4 |
|  w6   |  field3 |
|  w7   |  field1 |
|  w8   |  field1 |
+-------+---------+

so i want to validate any data that come into my data table by table key_word, on column word there is acceptable word and column field show this word should be just in this column in data table.
how can i do it with trigger??