The phrase "another purpose could be" is correct and usable in written English.
It can be used when introducing an alternative reason or intention for something that has been previously mentioned.
Example: "While the primary goal of the project is to increase efficiency, another purpose could be to enhance team collaboration."
Alternatives: "an additional aim might be" or "a different objective could be".
According to Kyle Anderson of MTV News the album might not have been "just another project", but rather the purpose could be "to prove the he has the skills to sustain a long and fulfilling career".
He was the first to write about the problems of "fungibility" - how development assistance provided for one purpose could be used to support quite another, since it eased general budget constraints.
Because the enzyme was so acidic, he concluded that its only purpose could be digestion.
Bad sex, for this purpose, could be just as enlightening as good.
A plan to regroup on a separate system, or on cell phones on a different network dedicated to that purpose, could be the answer.
That purpose could be accomplished, however, without expanding the coverage of Executive Order No. 11007 to include privately organized committees that received no federal funds.
Satellites that have served their purpose could be split into their modular parts or melted into 3D printer stock material, regenerating their successors.
There is a good chance that a system designed to achieve that limited purpose could be made palatable to Russia and America's European allies and, once tested and proved to be technologically reliable, win funding from Congress.
"It's hard to see what possible purpose could be served from cancelling the visas of people brought back from Nauru and Manus Island, many of whom have been recognised as refugees".
Among other things, the court ruled that the law's purpose could be better achieved, with less damage to free expression, if parents used filtering software to keep objectionable material away from children.
