The term "Alvegniats pump" seems to be obscure and may not have readily available synonyms. It is important to clarify the context or provide more information about this term to suggest suitable alternatives. Generally, a pump is a mechanical device used to move fluids or gases. Synonyms for a pump could include compressor, blower, suction device, or hydraulic machine, depending on the specific function. However, without concrete information about "Alvegniats pump", it is challenging to provide accurate synonyms. A more detailed description or clarification of the term would greatly assist in providing suitable alternatives.