different between validity vs effectiveness

English

valid +? -ity, borrowed from Middle French validité, from Late Latin validitas.

validity (countable and uncountable, plural validities)

The state of being valid, authentic or genuine.
State of having legal force.
A quality of a measurement indicating the degree to which the measure reflects the underlying construct, that is, whether it measures what it purports to measure (see reliability).

effective +? -ness

effectiveness (countable and uncountable, plural effectivenesses)

The property of being effective, of achieving results.
The effectiveness of the drug was well established.
The capacity or potential for achieving results.
The degree to which something achieves results.
He questioned the effectiveness of the treatment.
- 2013, Phil McNulty, "[1]", BBC Sport, 1 September 2013:
  United were having more possession but a sign of the effectiveness of Liverpool's defence was that it took the visitors 76 minutes to force Mignolet into serious action, when he dived to punch away a shot from substitute Nani.

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