Meaning of FURNITURE in English
BAD : The room was so full of furnitures it was difficult to move.
GOOD : The room was so full of furniture it was difficult to move.
Furniture is an uncountable noun: 'We need some new furniture for the lounge.' 'Our showrooms up and down the country stock the latest ideas in bedroom furniture.'
Longman Common Errors English vocabulary. Английский словарь распространенных ошибок Longman. 2012