Doubt: does Gayatri refer to Saraswathi?
Answer
Gayatri is a Devi and a Vedic metre or Chandas too with three paadams of eight letters apiece.
She as goddess is having three forms Gayatree Savitree and Saraswathi.
Maybe she is the goddess of words Saraswathi too.
And the vedic reference to Saraswathi especially Rigveda implies a river of that name, the Devi Gayatri we invoke in the mantra and also the Vaag devataa or mother of letters too.
We can choose to see all these as one or as three separate deities.
It is our choice