N filament, line, fiber, fibril, funicle, vein, hair, capillament, cilium, cilia, pilus, pili, tendril, gossamer, hair stroke, veinlet, venula, venule, wire, string, thread, packthread, cotton, sewing silk, twine, twist, whipcord, tape, ribbon, cord, rope, yarn, hemp, oakum, jute, strip, shred, slip, spill, list, band, fillet, fascia, ribbon, riband, roll, lath, splinter, shiver, shaving, beard, ramification, strand, filamentous, filamentiferous, filaceous, filiform, fibrous, fibrillous, thread-like, wiry, stringy, ropy, capillary, capilliform, funicular, wire-drawn, anguilliform, flagelliform, hairy, taeniate, taeniform, taenioid, venose, venous.

For further exploring for "venule" in Webster Dictionary Online