O que você está perguntando é: "O Word incorpora as fontes que ele usa." A resposta é, depende. Depende das configurações que você usa conforme explicado aqui .
"All TrueType and OpenType fonts have “embedding permissions” encoded within them, these are typically set by the font’s supplier, and are defined as part of the OpenType font file specification. There are a number of settings, but the main ones of interest are as follows:
No embedding— The font supplier does not allow embedding. These fonts are quite rare.
Print and preview— The font supplier allows for embedding but the document is locked and cannot be edited. Most third-party fonts have this setting.
Editable— The font supplier allows the font to be embedded within a document and allows the document to be edited using that embedded font.
Installable— This is the most permissive setting. The font supplier allows the font to be embedded within a document, and permits the document viewing application to permanently install the font on the user’s computer. Most applications treat these fonts like those set to Editable embedding."
O OS X é compatível com fontes TrueType e OpenType.