In ordinary speech 'particular' might sound like a small part of an object. In logic it is a technical term for a determinate individual or a concept referring to it.
'This entire house' can be particular if it identifies one definite house; the house is still a whole building.
'Door' is universal because it can apply to many doors, even though a door may be a physical component of a house. Logical particularity is not physical part-whole structure.
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Particular does not mean a physical part
Universal and Particular — Definitions and Practical Classification
In ordinary speech 'particular' might sound like a small part of an object. In logic it is a technical term for a determinate individual or a concept referring to it.
'This entire house' can be particular if it identifies one definite house; the house is still a whole building.
'Door' is universal because it can apply to many doors, even though a door may be a physical component of a house. Logical particularity is not physical part-whole structure.