A term for: When a taste or smell of a product is being concealed by another product
Solution 1:
Dominate
Usage:
Use in high concentrations causes the syrup flavour to dominate other flavours. Syrup tends to mask delicate flavours such as vanilla.
Reference, example found in Google Books: 'The Complete Technology Book on Flavoured Ice Cream' ASIA PACIFIC BUSINESS PRESS Inc., Jan 1, 2006
Credit goes to Jason Bassford in the comments