ADJ

critical, crucial, important, key, main, major, vital
basic, essential, fundamental, underlying
clear, clear-cut, definite, marked, obvious, real, rigid, sharp, strong
fine, subtle
broad, general
crude, simple
logical, valid
useful
arbitrary, artificial
invidious
making invidious distinctions between the 'deserving' and the 'undeserving' poor
absolute
Is there always an absolute distinction between right and wrong?
conventional, old, traditional
the conventional distinction between pure and applied science
formal
conceptual
theoretical
class, cultural, gender, moral

VERB + DISTINCTION

draw, make
She draws an important distinction between the different kinds of illness
recognize, see
We can see a sharp distinction between ambition and greed
blur
blurring the distinction between amateur and professional players

DISTINCTION + VERB

lie
Cultural distinctions lie at the heart of these issues

PREP

without ~
All groups are entitled to this money without distinction (= without a difference being made between them)
~ between

ADJ

considerable, great
modest
dubious
rare
unique
added
academic, intellectual, professional, social
Wearing the county tie was a mark of modest social distinction

VERB + DISTINCTION

have
He has the dubious distinction of being the first railway baron to go bankrupt
achieve
She achieved distinction in several fields of scholarship
add
Fennel leaves add distinction to any dish

PREP

of ~
She is a historian of great distinction
with ~
He served with distinction in the First World War