枕

pillow; bolster

introduction (e.g. to a rakugo story); lead-in

bedside; near one's pillow

laying one's head in someone's lap; using someone's lap for a pillow

body pillow; hug pillow

using one's arms as a pillow

Linguistics

pillow word; decorative word used prefixally in classical Japanese literature

preface; introduction

pillow fight

Railway

(railway) sleeper; (railroad) tie; crosstie

bedside

cooling pillow (often rubber)

using one's arm as a pillow; resting one's head on one's arm

bedside

The Pillow Book (Heian-period collection of writings by Sei Shōnagon)

trading sexual favours (for career advancement, etc.)

at the bedside where one dreams

wooden pillow

place that is often written about in waka poetry

oft-repeated descriptive epithets in poetry

overnight stay when traveling (travelling)

sleeping on grass in an open field

Work of art, literature, music, etc. name

Kusamakura (1906 novel by Natsume Sōseki); The Three-Cornered World; Grass Pillow

Botany

caruncle; strophiole

water-filled pillow

bed(side) screen

resting one's head on one's arm or elbow

makuragaeshi; monster that flips pillows over at night

changing a pillow position (esp. for a dead body)

acrobatic routine involving multiple wooden pillows