Boiler rooms are typically associated with illegal telemarketing scams, deceptive sales tactics and fraud. To avoid using this term, one could opt for more neutral words like "call centers," "tele-sales offices" or "telephone sales floors." These terms place emphasis on the telephone rather than the misleading nature of such activities. "Telemarketing centers" is another alternative that could be used to describe a legitimate call center. Other synonyms for "boiler rooms" could include "scam centers," "fraud factories" or "rip-off operations," but these terms may still carry negative connotations and may not be a suitable choice in all contexts.