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существенная часть stresses
gen.	gut (чего-либо); valid part (owant); part and parcel; soul (чего-л.); large segment (Ivan Pisarev); much of (Ivan Pisarev); most of (Ivan Pisarev); most part (Ivan Pisarev); large part of (Ivan Pisarev); large portion of (Ivan Pisarev); significant part of (Ivan Pisarev); substantial part of (Ivan Pisarev); essential part of (Ivan Pisarev); significant portion of (Ivan Pisarev); substantial portion of (Ivan Pisarev)
Игорь Миг	sizeable portion
el.	kernel
inf.	guts
law	essential; substantially all (proz.com flos); material particular (Право международной торговли On-Line)
math.	essential part (игры)
patents.	material part (изобретения)
существенные части
gen.	substantials

существенная часть: 15 phrases in 13 subjects

Applied mathematics	1
Computer networks	1
Construction	1
Economy	1
General	2
Informal	1
Information technology	1
Karachaganak	1
Makarov	2
Mass media	1
Oil / petroleum	1
Patents	1
Psychology	1