Fill in the grid with words.

Solution:

Based on the provided letters and the crossword grid, the words can be deduced as follows:

• КРАТЕР ( Crater)
• РЕКТОР (Rector)
• АКТЕР (Actor)
• ПЕТРО (Petro - likely part of a name or word)
• ПЕК (Pek - common abbreviation or part of a word)
• КАР (Kar - likely part of a word)
• РЕК (Rek - likely part of a word)
• ПОТ (Pot)
• АРЕ (Are)
• ЕКТ (Ect)
• РАП (Rap)
• ТЕП (Tep)
• ПАР (Par)
• РАК (Rak)
• КОР (Kor)

The completed grid is as follows, with letters filled in based on the provided clues and intersections:

Answer: The grid is filled with the words KPATЕР, РЕКТОР, AKTЕР, ПЕТРО, РЕК, ПАР, КАР, ПЕТ, ПОТ, ЕКТ, РАП, ТЕП, РАК, КОР, АРЕ.