لِأَنَّ مَنْ لَا يَعْرِفُ مَفْهُومَ اللَّفْظِ اسْتَحَالَ مِنْهُ أَنْ يَطْلُبَ وُجُودَ ذَلِكَ الْمَفْهُومِ
Whoever does not know a word's meaning cannot meaningfully inquire whether that meaning exists.
A question about existence presupposes some grasp of the concept under investigation. Thus conception and judgment are related in the logical analysis of inquiry, though they are not identical.
If a learner hears the name of an unfamiliar creature, the question 'What does that name mean?' is different from 'Does that creature exist?' The first seeks conception, and the second seeks a judgment concerning existence.