I'll Start......The word is 'Aphids'

Aphids is "Suitable for Framing"

As obvious as this may be, how about "Rosebud"?

yeah, that one is easy - How to Dial a Murder

Here's one: "carina"

That is from the word game they played in 'The Bye Bye Sky High I.Q. Murder Case'

Who could forget, Bertie?

Correct. Here's another:

A nickel

Could it be from DOUBLE EXPOSURE?

Yes it is - the nickel in the projector reel.

This place is like Oliver Brandt's think tank.

Well, I saw it pretty recently. And even then, I didn't remember for sure whether it was a nickel or some other coin.

Here's another one:

A banana

This is a wild guess, but could it be an answer to one of Oliver Brandt's multiple choice questions in BYE BYE SKU HIGH I.Q.? (I haven't seen it in forever but that bit with the quiz stays with me.)

Nope -

A hint: it's a physical prop and a spoken word.

"A trace of murder"! Also in that episode, someone tells Columbo, "there's no shame in accepting fruit!" :-)

Banana was also a prop used to keep Brimmer's car from starting in Death Lends a Hand.

I have one: "arachnid".

I'm on safer ground with that one. It's Elliott Markham in BLUEPRINT FOR MURDER.

Right, Clay, on banana!

Heel.

'Murder,Smoke and Shadows' the victim was electrocuted and a heel fell off a shoe which the lieutenant found

mark

Heel could also refer to Exercise in Fatality--Gene Stafford's brown heel marks on the gym floor.

Here's one: Almondine

In Publish or Perish, Columbo was recommended Trout Almondine. His reply was no surprise: "That's with almonds, huh? I think I'll have chili either with or without beans".

There was a great line later in that episode when Columbo tells another officer to "watch the chili in this town". "Too hot", the officer replies? "Too high", Columbo retorts in reference to the expensive meal.

you got it!

Episode is "Try and Catch Me"

Heel is not Try and Catch Me

I'll resurrect this game with the letter M

From three separate episodes:

Map
Mixer
Monkey

Monkey is DEATH HITS THE JACKPOT
Map is SWAN SONG ( YOU wouldn't dare mention UNDERCOVER....would you?)
Mixer is DOUBLE EXPOSURE

Monkey could also refer to “Negative Reaction” when Paul Galesko referred to his marriage as being a monkey chained to an organ grinder. The mixers are in “Double Shock”.

How about:
Glow sticks
Haircut (two to choose from)
Manicure (two)
Schrapnel
Carrot juice
Beeper

OLD FASHION MURDER

Bruce, both Old Fashioned Murder and another episode have a bad guy character who was framed by the real murderer and then killed. In both cases they got a haircut and manicure before they died.

Glow sticks - I can't answer without help from Google, so I'm withholding my answer!

Haircut - Old Fashioned Murder and Bird in the Hand

Manicure - Old Fashioned Murder and Columbo Likes the Nightlife

Schrapnel - Grand Deceptions ??

Carrot juice - An exercise in Fatality ??

Beeper - Columbo Cries Wolf

The glow sticks were from Columbo Likes the Nightlife. Columbo saw the liquid smeared on a car and it gave him a clue. A girl offered him a glow stick.

The haircut and manicures were both from framed victims in Old Fashioned Murder and A Bird in Hand. Maybe "Nightlife" had one too, but I don't remember.

I supposed the shrapnel could also be from Grand Deceptions, but I was thinking about the cremated body that had metal in it, therefore giving Columbo his final "gotcha" evidence in Ashes to Ashes.

You were correct with the carrot juice and beeper. Nice work. I always thought it was funny that a fitness guru would have vitamin pills and non-sugar juice after a strenuous workout.

re: Monkey could also refer to “Negative Reaction” when Paul Galesko referred to his marriage as being a monkey chained to an organ grinder. The mixers are in “Double Shock”.

TR:

Monkey was DEATH HITS THE JACKPOT
Mixers were DOUBLE SHOCK, correct
Maps were COLUMBO GOES to the GUILLOTINE

Monkey is DEATH HITS THE JACKPOT
Map is COLUMBO GOES TO THE GUILLOTINE
Mixer is DOUBLE SHOCK